JP6437073B1 - Power conversion control system - Google Patents

Abstract

An object of the present invention is to provide a power conversion control system capable of suppressing overlap between a zero cross point detection process and a maintenance data reception process.
A power conversion control system includes a power conversion device that converts AC power into DC power, and a gateway device that divides maintenance data into a plurality of frames and transmits the frames to the power conversion device. After receiving the start frame from the gateway device 30, the power conversion device 20 transmits the data of each frame so that the detection timing of the zero cross point and the timing of receiving the data of each frame do not overlap based on the zero cross point. Flow control information for instructing timing is calculated and transmitted to the gateway device 30.
[Selection] Figure 1

Description

  The present invention relates to a power conversion control system including a power conversion device that converts AC power into DC power.

  In recent years, electric vehicles have attracted attention as environmentally friendly vehicles. An electric vehicle includes an electric motor that generates a driving force for driving and a driving battery that stores electric power supplied to the electric motor. Examples of such an electric vehicle include an electric vehicle and a plug-in hybrid vehicle.

  In addition, a technology for charging a driving battery mounted on these electric vehicles from an external power source has been developed. Among such techniques, a generally known technique is a technique for charging a driving battery using an outlet of a commercial power source provided in a general household. In this technology, the battery for driving the electric vehicle is charged from the commercial power source via the charging cable by connecting the commercial power source and the electric vehicle with the charging cable.

  At this time, since the commercial power source is an AC power source, in order to charge the drive battery, a power conversion device for converting AC power into DC power is required. In such a power converter, it is required to improve the power factor in order to suppress the influence of reactive power on the power network and electromagnetic noise.

  Therefore, for example, the power factor correction apparatus described in Patent Document 1 includes a zero-cross detection circuit for detecting a zero-cross point of the input voltage waveform of the AC power supply. The control unit calculates a reference current waveform that is a target of the input current based on the zero cross point detected by the zero cross detection circuit. Further, the phase adjusting means advances or delays the reference current waveform so that the phase difference becomes small according to the phase difference between the input current and the reference current waveform.

  Further, for example, the power factor correction apparatus described in Patent Document 2 prevents the zero-cross point detection process and the message reception process from overlapping, and suppresses the deviation of the reference current waveform used for the power factor improvement, A system that improves power factor is shown.

JP 2012-222911 A JP 2017-085779 A

  As described above, in the power factor correction device disclosed in Patent Document 1, the control unit calculates the reference current waveform that is the target of the input current based on the detected zero cross point. For this reason, when the control unit is executing a high priority process such as a communication process when the zero cross point is detected, the control unit gives priority to the process. For this reason, this power factor correction apparatus has a problem that it cannot immediately execute the zero cross point detection process.

  This will be described more specifically. For example, when the control unit receives a communication message from another electronic control device when the zero cross detection circuit detects a zero cross point, the control unit gives priority to the reception process. For this reason, the control unit executes the zero cross point detection process after completing the reception process of the communication message. Therefore, the zero cross point used for the detection process by the control unit is a zero cross point delayed by the execution time of the reception process. Since the reference current waveform is calculated using such a zero cross point, the power factor correction apparatus cannot obtain an accurate reference current waveform.

  For this reason, in the power factor correction device of Patent Document 2, if it is determined that the time difference between the reception time of the periodic message from the second control device and the detection time of the zero cross point is equal to or less than the threshold value, the transmission timing change message is transmitted. Send. The second control device that has received the transmission timing change message changes the transmission timing. However, the technique of Patent Document 2 has a problem that the message transmitted from the second control device cannot be applied unless it is periodic.

  In recent years, software update via wireless network called Over-The-Air (OTA) and remote diagnosis via wireless network are attracting attention because they can update and diagnose software without bringing the vehicle to a maintenance shop. . Since OTA and remote diagnosis are not performed while the vehicle is stopped, it is necessary to receive diagnostic data while the vehicle is running or charging.

  The OTA software update information and remote diagnosis communication data notified via the wireless network are sent from the gateway device to the electronic control device to be diagnosed by in-vehicle communication. For this in-vehicle communication, CAN (Controller Area Network) communication, which is a bus-type in-vehicle communication standard, has become a standard in practice. In diagnostic communication by CAN communication, segmented data is transmitted in multiple frames. At this time, since the gateway device on the transmission side starts transmitting diagnostic data at an arbitrary timing, the electronic control device on the reception side may overlap the zero cross point detection process and the reception of CAN communication. In that case, since the reception process is given priority, the above-described problem occurs.

  Therefore, when the gateway device divides maintenance data for maintaining the power conversion device into a plurality of frames and sequentially transmits them to the power conversion device, the zero cross point detection processing and the maintenance data reception processing overlap. A power conversion control system that can suppress the above is desired.

  The power conversion control system according to the present invention divides maintenance data for converting the AC power into DC power and maintenance data for the power conversion device into a plurality of frames, and the divided data of each frame is A start frame including information on the maintenance data that starts transmission when the gateway apparatus starts transmission of the maintenance data. A start frame transmission unit for transmitting the data of each frame to the power conversion device at a timing specified in the flow control information transmitted from the power conversion device in response to the start frame. A maintenance data transmission unit that sequentially transmits the power conversion device, wherein the input AC voltage crosses zero volts. A zero-crossing detection unit that detects a zero-crossing point that is a point in time, a timing for detecting the zero-crossing point based on the detected zero-crossing point and the transmission time of the data of each frame after receiving the start frame, and the respective From the gateway device, a flow control information transmitting unit that calculates the flow control information for instructing the transmission timing of the data of each frame and transmits it to the gateway device so that the timing of receiving the frame data does not overlap. A maintenance data receiving unit for receiving the transmitted data of each frame.

  According to the power conversion control system of the present invention, the flow control information that instructs the transmission timing of the data of each frame is calculated so that the timing of detecting the zero cross point and the timing of receiving the data of each frame do not overlap. Therefore, even if continuous maintenance data is received, it is possible to suppress the overlap between the zero cross point detection process and the maintenance data reception process, and the zero cross point detection accuracy will deteriorate. Can be suppressed.

It is a block diagram which shows schematic structure of the power conversion control system which concerns on Embodiment 1 of this invention. It is a hardware block diagram of the gateway apparatus which concerns on Embodiment 1 of this invention. It is a circuit diagram of the power converter device concerning Embodiment 1 of the present invention. It is a hardware block diagram of the power conversion control apparatus which concerns on Embodiment 1 of this invention. It is a timing chart for demonstrating control of the power converter device which concerns on Embodiment 1 of this invention. It is a sequence diagram for demonstrating the basic communication operation | movement according to the CAN communication specification which concerns on Embodiment 1 of this invention. It is a figure explaining the parameter of the flow control information which concerns on Embodiment 1 of this invention. It is a sequence diagram for demonstrating the basic communication operation | movement according to the flow control information which concerns on Embodiment 1 of this invention. It is a flowchart for demonstrating the calculation process of the flow control information which concerns on Embodiment 1 of this invention. It is a timing chart which shows the transmission / reception behavior of the maintenance data which concerns on Embodiment 1 of this invention. It is a timing chart which shows the transmission / reception behavior of the maintenance data which concerns on Embodiment 1 of this invention. It is a flowchart for demonstrating the calculation process of the flow control information which concerns on Embodiment 2 of this invention. It is a timing chart which shows the transmission / reception behavior of the maintenance data which concerns on Embodiment 2 of this invention.

  Hereinafter, a power conversion control system 1 according to an embodiment of the present invention will be described with reference to the drawings. In each figure, the same numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a schematic configuration of a vehicle equipped with a power conversion control system 1 according to the first embodiment. However, in FIG. 1, illustration of components that are not directly related to the present invention is omitted.

  The power conversion control system 1 according to Embodiment 1 includes a power conversion device 20 and a gateway device 30. The power conversion control system 1 is mounted on a vehicle having at least an electric motor as a driving force source for wheels.

<Gateway device 30>
The gateway device 30 receives maintenance data transmitted from the center 60 outside the vehicle via the communication device 40 and the wireless network. The center 60 is a server for centrally monitoring and maintaining the state of the power conversion device 20 of each vehicle. The maintenance data is data for maintaining the power conversion device 20. The maintenance data includes update data for updating software of the power conversion device 20 (power conversion control device 22), and diagnostic data for monitoring and diagnosing the power conversion device 20. The diagnostic data includes power conversion such as cumulative time when the power conversion device 20 performs power conversion, charging capacity of the power storage device 5 charged by the power conversion device 20, abnormality information of components such as switching elements of the power conversion device 20, and the like. Data requesting to return various states related to the device 20 is included. The communication device 40 may be integrated with the gateway device 30 or may be an information communication device such as a mobile phone brought into the vehicle and may be communicably connected to the gateway device 30.

  As shown in FIG. 1, the gateway device 30 includes functional units such as a maintenance data receiving unit 31, a maintenance data transmitting unit 32, and a response receiving unit 33. The maintenance data receiving unit 31 receives maintenance data transmitted from the center 60. The maintenance data transmission unit 32 divides the received maintenance data into a plurality of frames, and transmits the data of each divided frame to a target in-vehicle device such as the power conversion device 20. The response receiving unit 33 receives response data for the maintenance data transmitted from the power conversion device 20 and transmits the response data to the center 60.

  Each functional unit 31 to 33 of the gateway device 30 is realized by a processing circuit provided in the gateway device 30. As illustrated in FIG. 2, the gateway device 30 includes, as processing circuits, an arithmetic processing device 80 (computer) such as a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory). 80 for communicating with each electronic device in the vehicle, such as a storage device 81 for exchanging data with 80, a communication interface 82 for connecting the arithmetic processing unit 80 and the communication device 40 so as to allow data communication, and the power conversion control device 22 A communication circuit 83 and the like are provided. The communication circuit 83 performs data communication based on a communication protocol (CAN (Controller Area Network) in this example) via an in-vehicle device such as the power conversion control device 22 via a communication line. CAN is a CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) communication protocol. As for each function of the gateway device 30, the arithmetic processing device 80 executes software (program) stored in the storage device 81, and other hardware of the gateway device 30 such as the storage device 81, the communication interface 82, and the communication circuit 83. It is realized by collaborating with.

<Power converter 20>
The power converter 20 converts AC power into DC power. The power conversion device 20 is connected to an AC power source 6 provided outside the vehicle via a connector 41. Power conversion device 20 converts AC power supplied from AC power supply 6 into DC power, and charges power storage device 5 provided in the vehicle.

  The power conversion device 20 includes a power conversion circuit 21 that includes a switching element, and a power conversion control device 22 that performs on / off control of the switching element. In the present embodiment, as shown in FIG. 3, the power conversion circuit 21 includes a full-wave rectifier circuit 23 that rectifies AC power and a boost chopper circuit 24 that boosts the rectified DC power. The full-wave rectifier circuit 23 includes two sets of two rectifier elements 29 (in this example, rectifier diodes 29) connected in series. The step-up chopper circuit 24 includes a choke coil 25, a switching element 26, a rectifier diode 27, and a smoothing capacitor 28. As the switching element 26, a metal oxide semiconductor field effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), or the like is used. The power conversion circuit 21 is not limited to the example in FIG. 3, and various known types can be used.

  As shown in FIG. 1, the power conversion control device 22 includes an AC voltage detection unit 51, a zero cross detection unit 52, a switching control unit 53, a flow control information transmission unit 54, a maintenance data reception unit 55, a maintenance data processing unit 56, and the like. The functional part is provided.

  Each functional unit 51 to 56 of the power conversion control device 22 is realized by a processing circuit provided in the power conversion control device 22. As shown in FIG. 4, the power conversion control device 22 includes, as a processing circuit, an arithmetic processing device 90 (computer) such as a CPU, a storage device 91 that exchanges data with the arithmetic processing device 90 such as a RAM and a ROM, and arithmetic processing. An input circuit 92 for inputting an external signal to the device 90, an output circuit 93 for outputting a signal from the arithmetic processing device 90 to the outside, and the arithmetic processing device 90 perform data communication with each electronic device in the vehicle such as the gateway device 30. A communication circuit 94 and the like are provided. A plurality of the same type or different types may be provided as the arithmetic processing unit 90, and each process may be shared and executed. The input circuit 92 is connected to various sensors such as a voltage sensor 95 that detects an AC voltage input from the AC power supply 6 and a current sensor 96 that detects an input current input from the AC power supply 6. Are input to the arithmetic processing unit 90. The output circuit 93 includes a gate drive circuit that outputs an on / off drive signal for the gate terminal of the switching element 26. The communication circuit 94 performs data communication based on a communication protocol (CAN in this example) via an in-vehicle device such as the gateway device 30 via a communication line.

  The AC voltage detection unit 51 detects an AC voltage input from the AC power supply 6 to the connector 41 based on the output signal of the voltage sensor 95. And the zero cross detection part 52 detects the zero cross point which is a time of an alternating voltage crossing zero volt | bolt based on the alternating voltage detected by the alternating voltage detection part 51. FIG. The zero cross detection unit 52 detects a time when the AC voltage crosses zero volts as a zero cross point by a timer function.

  Further, the zero cross detection unit 52 calculates the time interval of the zero cross points based on the detected zero cross points. The time interval between zero cross points refers to the time interval between adjacent zero cross points. This zero cross point time interval varies depending on the frequency of the AC power supply 6. For example, when the AC power source 6 is 50 Hz, the zero cross point time interval is 10 ms, and when the AC power source 6 is 60 Hz, the zero cross point time interval is 8.33 ms (rounded to the second decimal place).

  The switching control unit 53 performs on / off control of the switching element based on the detected zero cross point. In the present embodiment, as shown in FIG. 5, the switching control unit 53 calculates a target current (reference current waveform) of the current input from the AC power supply 6 based on the detected zero cross point. The switching control unit 53 detects the current input from the AC power supply 6 based on the output signal of the current sensor 96. Then, the switching control unit 53 performs on / off control of the switching element 26 by PWM control (Pulse Width Modulation) so that the detected current value approaches the target current.

  In the present embodiment, the switching control unit 53 calculates a target current having a waveform similar to the waveform of the AC voltage in order to improve the power factor. That is, the switching control unit 53 calculates a target current of a sine wave having a time interval period of zero cross points that becomes zero at the zero cross point.

  When a zero cross point detection error occurs, a target current setting error occurs and the power factor decreases. When receiving maintenance data from the gateway device 30, even if a zero cross point occurs, the reception process is continued, so execution of the zero point detection process is delayed. As a result, the detection of the zero cross point is delayed by the time until the reception process is completed, and a detection error of the zero point occurs. Therefore, it is desired that maintenance data reception timing and the zero cross point can be prevented from overlapping.

<Basic operation for sending and receiving maintenance data>
First, the basic operation of transmission / reception of maintenance data will be described. As described above, the maintenance data transmission unit 32 of the gateway device 30 divides the received maintenance data into a plurality of frames, and transmits the data of each divided frame to the power conversion device 20. In the present embodiment, when the maintenance data transmission unit 32 starts transmission of maintenance data, the maintenance frame transmission unit 32 transmits a start frame FF including information on maintenance data to start transmission to the power conversion device 20; A data transmission unit 35 that sequentially transmits the data of each frame to the power conversion device 20 at a timing specified in the flow control information FC transmitted from the power conversion device 20 in response to the start frame FF. Yes.

  On the other hand, after receiving the start frame FF, the power conversion control device 22 calculates the flow control information FC for instructing the transmission timing of the data of each frame and transmits the flow control information FC to the gateway device 30, and the gateway A maintenance data receiving unit 55 that receives data of each frame transmitted from the device 30.

<Basic operation according to CAN communication specifications>
In the present embodiment, transmission / reception of maintenance data is performed in accordance with the communication specification of CAN diagnostic communication defined in ISO15765. Hereinafter, the basic operation of transmission / reception will be described in detail.

  In accordance with the provisions of ISO15765, communication is performed between the gateway device 30 on the data transmission side and the power conversion device 20 (power conversion control device 22) on the data reception side as shown in FIG. In ISO15765, data communication is performed in units of frames. One subsequent frame CF can include maintenance data of 7 bytes (56 bits). The start frame FF can include 6-byte maintenance data. The data length of one frame is 108 bits at the minimum including the header and the like, and extends slightly from 108 bits depending on the data value. In this embodiment, since the communication speed is 500 kbps, the time for transmitting and receiving one frame is 216 μsec at the minimum. Therefore, the maintenance data transmission unit 32 divides the received maintenance data into 7 bytes per frame (start frame is 6 bytes), and transmits the data of each frame to the power conversion device 20 in order. That is, in this embodiment, the amount of maintenance data divided into each frame is determined in advance, and the transmission / reception time of each frame is determined in advance.

  First, the start frame transmission unit 34 of the gateway device 30 transmits a start frame FF (First Frame) including information on maintenance data for starting transmission to the power conversion control device 22. The start frame FF includes information on the total data length of maintenance data to be transmitted. The start frame FF includes the first 6 bytes of maintenance data.

  In response to the start frame FF, the flow control information transmission unit 54 of the power conversion control device 22 transmits a frame of flow control information FC (Flow Control) instructing the transmission timing of the data of each frame to the gateway device 30. The calculation logic of the flow control information FC will be described later. As shown in FIG. 7, the flow control information FC includes parameters of a receivable state FS, a receivable frame number BS, and a reception interval STmin between frames.

  The receivable state FS is set to one of “0”, “1”, and “2”. “0” is “continuous reception is possible”, “1” is “standby” requesting to wait without performing transmission because it cannot be received, and “2” is an excessive amount of data. “Overflow” indicating that reception is not possible. When the number of receivable frames BS is “0”, it indicates that unlimited reception is possible, and when it is “1” to “255”, the set number of frames can be continuously received. Represents.

  When the reception interval STmin is “0”, continuous reception is possible without leaving a time interval between frames, and when the reception interval STmin is “1” to “255”, the interval between frames is Indicates that reception is possible with a set time interval. For example, when the reception interval STmin is “100”, it indicates that reception is possible if there is 100 ms between frames. However, as the reception interval STmin becomes longer, the time taken to complete the transmission becomes longer, so that the reception interval STmin = 0 (0 ms) is usually set.

  The maintenance data transmission unit 32 of the gateway device 30 transmits data of the second and subsequent subsequent frames CF (Consecutive Frame) according to the received flow control information FC.

  Next, the flow of maintenance data transmission / reception will be described with reference to FIG. First, the case where “standby” is commanded in the flow control information FC will be described. After the start frame FF is transmitted from the gateway device 30 to the power conversion control device 22, the flow control information transmission unit 54 of the power conversion control device 22 sets the flow control information of “FS = 1, BS = 0, STmin = 0”. The FC is transmitted to the gateway device 30. Here, FS = 1 is “standby”. Since the received flow control information FC is a “standby” command, the data transmission unit 35 of the gateway device 30 waits for the next flow control information FC without transmitting the subsequent frame CF of the maintenance data.

  When the flow control information transmission unit 54 of the power conversion control device 22 determines that the maintenance data can be received, the flow control information FC of “FS = 0, BS = 0, STmin = 0” to the gateway device 30. Send. Here, FS = 0 is “continuous reception is possible”, BS = 0 is “unlimited continuous reception is possible”, and STmin = 0 is “reception is possible without a time interval between frames”. is there. Since the “standby” command has been canceled (FS = 0), the data transmission unit 35 of the gateway device 30 follows the instructions of BS = 0 and STmin = 0, and all subsequent maintenance data frames CF # 1, # 2 , # 3... #N are sequentially transmitted in order at a transmission interval of 0 ms.

  Next, the case where the number of continuous transmissions and the transmission interval are specified in the flow control information FC will be described. When the start frame FF is transmitted from the gateway device 30 to the power conversion control device 22, the flow control information transmission unit 54 of the power conversion control device 22 sets the flow control information of “FS = 0, BS = 3, STmin = 10”. The FC is transmitted to the gateway device 30. Here, BS = 3 is “3 frames can be continuously received” and STmin = 10 is “can be received with a time interval between 10 ms frames”. The data transmission unit 35 of the gateway device 30 continuously transmits the subsequent frames CF # 1, # 2, and # 3 of the three maintenance data in order with a transmission interval of 10 ms in accordance with the instructions of BS = 3 and STmin = 10. After that, it waits for the next flow control information FC. After receiving the subsequent frame CF three times, the flow control information transmission unit 54 of the power conversion control device 22 transmits the flow control information FC of “FS = 0, BS = 0, STmin = 5” to the gateway device 30. The data transmission unit 35 of the gateway device 30 follows the instructions of BS = 0 and STmin = 5, and sequentially follows subsequent frames CF # 4, # 5... #N of all remaining maintenance data with a transmission interval of 5 ms. Send continuously.

<Calculation of flow control information FC to avoid zero cross points>
In the present embodiment, after receiving the start frame FF, the flow control information transmission unit 54 determines the timing of detecting the zero cross point and the data of each frame based on the detected zero cross point and the transmission time of the data of each frame. The flow control information FC is calculated and transmitted to the gateway device 30 so that the reception timing does not overlap.

  Details of the calculation processing of the flow control information FC that avoids this zero cross point will be described with reference to the flowchart of FIG. First, in step S510, the zero cross detection unit 52 of the power conversion control device 22 detects the zero cross point (time) as described above.

  The maintenance data receiving unit 55 receives the start frame FF transmitted from the gateway device 30. In step S520, the flow control information transmission unit 54 proceeds to step S530 when the start frame FF is received, and ends the process when the start frame FF is not received.

  When the flow control information transmission unit 54 receives the start frame FF (step S520: YES), in step S530, the flow control information transmission unit 54 determines the next zero cross based on the zero cross point detected in step S510 and the data transmission time of each frame. By the point, it is determined whether or not data having a number of frames equal to or greater than a predetermined determination number can be received. The number of determinations is set to a natural number of 1 or more.

  The transmission time of data of each frame is set in advance as described above, and is a minimum of 216 μsec in ISO 15765 of this embodiment. The flow control information transmission unit 54 predicts the next zero cross point (time) from the past zero cross point (time). The flow control information transmission unit 54 calculates a time interval from the current time when the start frame FF is received to the next zero cross point (time), and subtracts the transmission time of the frame of the flow control information FC from the calculated time interval. Is divided by the value obtained by adding the reception interval STmin between frames (0 in this example) to the transmission time of data of each frame (216 μsec in this example), and the value obtained by rounding down the decimal point of the divided value is Calculated as the number of frames that can be received before the next zero cross point. At this time, considering the fluctuation of the transmission time of each frame, processing delay, etc., the data transmission time or the time interval until the next zero cross point (time) is calculated so that the number of receivable frames is reduced. A margin may be provided. Then, the flow control information transmission unit 54 determines whether or not the calculated number of receivable frames is equal to or greater than the determination number.

  If the flow control information transmission unit 54 determines that data of the number of frames equal to or greater than the determination number can be received by the next zero cross point (step S530: YES), the flow control information transmission unit 54 proceeds to step S540, and the time to the next zero cross point and each time Based on the transmission time of frame data, the gateway device calculates the number of frames that can be received by the next zero cross point and uses the flow control information FC as a transmission command for requesting transmission of data of the number of frames that can be received. 30. Since the calculation of the number of receivable frames is the same as the process in step S530, the description is omitted. In the present embodiment, the flow control information transmission unit 54 sets “0” indicating “continuous reception is possible” in the receivable state FS in the flow control information FC, and sets “0” as the receivable frame number BS. “Calculated number of receivable frames” is set, and “0” is set to the reception interval STmin between frames.

  Although not shown in FIG. 9, when the maintenance data transmission unit 32 of the gateway device 30 receives the flow control information FC of the transmission command, the maintenance data transmission unit 32 sequentially transmits data of the requested number of frames. In the present embodiment, when the receivable state FS is “0”, the maintenance data transmission unit 32 sequentially transmits the subsequent frames CF of the receivable frame number BS at the reception interval STmin. Then, the maintenance data receiving unit 55 of the power conversion control device 22 receives the transmitted subsequent frame CF.

  In subsequent step S560, maintenance data receiving unit 55 determines whether or not all maintenance data has been received. The maintenance data receiving unit 55 determines whether the total maintenance data included in each frame received so far has reached the total data length of the maintenance data included in the start frame FF. If all the maintenance data has been received, the process is terminated. If all the maintenance data has not been received, the process proceeds to step S570.

  In step S570, the maintenance data receiving unit 55 determines whether a frame having the receivable frame number BS instructed by the flow control information FC has been received. The maintenance data receiving unit 55 proceeds to step S580 when receiving a frame having the receivable frame number BS, and returns to step S560 when not receiving a frame having the receivable frame number BS, and starts the frame FF. This is repeated until the total data length of the maintenance data included in is reached or a frame having the receivable frame number BS is received.

  On the other hand, if the flow control information transmission unit 54 determines that data of the number of frames equal to or greater than the determination number cannot be received by the next zero cross point (step S530: NO), the flow control information transmission unit 54 proceeds to step S550 and transmits the data of each frame. A standby command requesting standby without performing is transmitted to the gateway device 30 as the flow control information FC, and then the process proceeds to step S580. In the present embodiment, the flow control information transmission unit 54 sets “1” indicating “standby” in the receivable state FS in the flow control information FC, the number of receivable frames BS, and the reception interval STmin between frames. Is set to an arbitrary value, for example, “0”.

  Although not shown in FIG. 9, when the maintenance data transmission unit 32 receives the flow control information FC of the standby command, the maintenance data transmission unit 32 waits without transmitting the data of each frame. In the present embodiment, when the receivable state FS is “1”, the maintenance data transmission unit 32 waits without transmitting the subsequent frame CF.

  In step S580, the flow control information transmission unit 54 determines whether the zero cross point has elapsed. If the zero cross point has elapsed, the flow control information transmission unit 54 proceeds to step S590. If the zero cross point has not elapsed, step S580 is repeated until the zero cross point has elapsed.

  In step S590, the flow control information transmission unit 54 calculates the number of frames that can be received up to the next zero cross point based on the time up to the next zero cross point and the transmission time of the data of each frame, and the reception is possible. A transmission command for requesting transmission of data of the number of frames is transmitted to the gateway device 30 as flow control information FC.

  In the present embodiment, the flow control information transmission unit 54 calculates a time interval from the current zero cross point to the next zero cross point based on the current and past zero cross points (time), and the flow is calculated from the calculated time interval. The value obtained by subtracting the transmission time of the frame of the control information FC is divided by the value obtained by adding the reception interval STmin (0 in this example) between the frames to the transmission time of data of each frame (216 μsec in this example). The value obtained by rounding down the decimal point of the value is calculated as the number of frames that can be received by the next zero cross point. At this time, a margin may be provided in the data transmission time or the time interval between zero cross points.

  In the flow control information FC, the flow control information transmission unit 54 sets “0” indicating “continuous reception is possible” in the receivable state FS, and “calculated reception is possible in the number of receivable frames BS”. "No. of frames" is set, and "0" is set to the reception interval STmin between frames.

  Although not shown in FIG. 9, when the maintenance data transmission unit 32 of the gateway device 30 receives the flow control information FC of the transmission command, the maintenance data transmission unit 32 sequentially transmits data of the requested number of frames. In the present embodiment, when the receivable state FS is “0”, the maintenance data transmission unit 32 sequentially transmits the subsequent frames CF of the receivable frame number BS at the reception interval STmin. Then, the maintenance data receiving unit 55 of the power conversion control device 22 receives the transmitted subsequent frame CF.

  In subsequent step S600, maintenance data receiving unit 55 determines whether or not all maintenance data has been received. The maintenance data receiving unit 55 determines whether the total maintenance data included in each frame received so far has reached the total data length of the maintenance data included in the start frame FF. If all the maintenance data has been received, the process is terminated. If all the maintenance data has not been received, the process proceeds to step S610.

  In step S610, the maintenance data receiving unit 55 determines whether or not a frame having the receivable frame number BS commanded by the flow control information FC has been received. The maintenance data receiving unit 55 returns to step S580 when a frame having the receivable number of frames BS is received, and returns to step S600 when not receiving a frame having the receivable number of frames BS to start frame FF. This is repeated until the total data length of the maintenance data included in is reached or a frame having the receivable frame number BS is received. Therefore, the flow control information transmission unit 54 calculates the flow control information FC in step S590 every time the zero cross point passes until the reception of all the maintenance data after receiving the start frame FF, and the gateway device 30. Send to.

<Example of transmission / reception behavior>
FIG. 10 shows an example of maintenance data transmission / reception behavior by the processing of the flowchart of FIG. The example of FIG. 10 shows a case where the total number of subsequent frames CF is 14, the reception interval STmin between frames is 1 ms, the AC power supply 6 is 50 Hz, and the time interval between zero cross points is 10 ms. ing.

  First, when the flow control information transmission unit 54 receives the start frame FF, it takes 4 ms until the next zero cross point, and therefore, (4−0.216) ÷ (0.216 + 1) = 3.11. Since it is determined that the subsequent frame CF can be received and is equal to or greater than the determination number set to 3, FS = 0 (continuous reception is possible), BS = 3 (number of receivable frames), STmin = 1 (reception interval) is set and transmitted to the gateway device 30. The maintenance data transmission unit 32 of the gateway device 30 sequentially transmits three subsequent frames CF # 1, # 2, and # 3 at 1 ms intervals in accordance with the flow control information FC. The maintenance data receiving unit 55 receives the three transmitted subsequent frames CF # 1, # 2, and # 3.

  After receiving the subsequent frame CF # 3, the power conversion control device 22 executes the zero cross point detection process by the zero cross detection unit 52 without a processing delay due to the reception process, and waits for the zero cross point to elapse. When the flow control information transmission unit 54 determines that the zero cross point has elapsed, since it is 10 ms until the next zero cross point, the calculation of (10−0.216) ÷ (0.216 + 1) = 8.04 results in 8 It is determined that the subsequent frame CF can be received, and FS = 0 (continuous reception is possible), BS = 8 (number of frames that can be received), and STmin = 1 (reception interval) are set in the flow control information FC. Send to. The maintenance data transmission unit 32 of the gateway device 30 sequentially transmits the eight subsequent frames CF # 4 to # 11 at 1 ms intervals in accordance with the flow control information FC. Then, the maintenance data receiving unit 55 receives the transmitted eight subsequent frames CF # 4 to # 11. Note that the flow control information transmission unit 54 may determine that the seven subsequent frames CF can be received in consideration of a margin for variation in transmission time, processing delay, and the like.

  After receiving the subsequent frame CF # 11, the power conversion control device 22 executes the zero cross point detection process by the zero cross detection unit 52 without processing delay and waits for the zero cross point to elapse. When the flow control information transmission unit 54 determines that the zero cross point has elapsed, since it is 10 ms until the next zero cross point, the calculation of (10−0.216) ÷ (0.216 + 1) = 8.04 results in 8 It is determined that the subsequent frame CF can be received, and FS = 0 (continuous reception is possible), BS = 8 (number of frames that can be received), and STmin = 1 (reception interval) are set in the flow control information FC. Send to. The maintenance data transmission unit 32 of the gateway device 30 sequentially transmits the remaining three subsequent frames CF # 12 to # 14 at intervals of 1 ms in accordance with the flow control information FC. Then, the maintenance data receiving unit 55 receives the transmitted three subsequent frames CF # 12 to # 14, and the total of the received maintenance data reaches the total data length of the maintenance data included in the start frame FF. Therefore, the maintenance data reception process is terminated.

  In this manner, the timing for detecting the zero cross point and the timing for receiving the data of each frame can be prevented from overlapping, and the detection error of the zero cross point can be suppressed. Therefore, the control accuracy of the on / off control of the switching element based on the detected zero cross point can be reduced, and the power factor of the power conversion device 20 can be suppressed from decreasing.

  Next, FIG. 11 shows another example of transmission / reception behavior. In the example of FIG. 11, the total number of subsequent frames CF is 11, the reception interval STmin between frames is 1 ms, the AC power supply 6 is 60 Hz, and the time interval between zero cross points is 8.33 ms. Is shown.

  First, when the flow control information transmission unit 54 receives the start frame FF, since it is 2 ms until the next zero cross point, one (1) is calculated by the calculation of (2−0.216) ÷ (0.216 + 1) = 1.46. Since it is determined that the subsequent frame CF can be received, and the number is less than the determination number set to 3, FS = 1 (standby) is set in the flow control information FC and transmitted to the gateway device 30. The maintenance data transmission unit 32 of the gateway device 30 waits without transmitting the subsequent frame CF until the next flow control information FC is received in accordance with the standby command for the flow control information FC.

  The power conversion control device 22 executes the zero cross point detection process by the zero cross detection unit 52 without any processing delay, and waits for the zero cross point to elapse. When the flow control information transmission unit 54 determines that the zero cross point has elapsed, since it is 8.33 ms until the next zero cross point, the calculation of (8.33−0.216) ÷ (0.216 + 1) = 6.67 Thus, it is determined that six subsequent frames CF can be received, and FS = 0 (continuous reception is possible), BS = 6 (number of frames that can be received), and STmin = 1 (reception interval) are set in the flow control information FC. To the gateway device 30. The maintenance data transmission unit 32 of the gateway device 30 sequentially transmits six subsequent frames CF # 1 to # 6 at 1 ms intervals in accordance with the flow control information FC. The maintenance data receiving unit 55 receives the six subsequent frames CF # 1 to # 6 that have been transmitted.

  After receiving the subsequent frame CF # 6, the power conversion control device 22 executes the zero cross point detection process by the zero cross detection unit 52 without any processing delay, and waits for the zero cross point to elapse. When the flow control information transmission unit 54 determines that the zero cross point has elapsed, since it is 8.33 ms until the next zero cross point, the calculation of (8.33−0.216) ÷ (0.216 + 1) = 6.67 Thus, it is determined that six subsequent frames CF can be received, and FS = 0 (continuous reception is possible), BS = 6 (number of frames that can be received), and STmin = 1 (reception interval) are set in the flow control information FC. To the gateway device 30. The maintenance data transmission unit 32 of the gateway device 30 sequentially transmits the remaining five subsequent frames CF # 7 to # 11 at 1 ms intervals in accordance with the flow control information FC. Then, the maintenance data receiving unit 55 receives the transmitted five subsequent frames CF # 7 to # 11, and the total of the received maintenance data reaches the total data length of the maintenance data included in the start frame FF. Therefore, the maintenance data reception process is terminated.

  10 and 11, the reception interval STmin between frames has been described as 1 ms. However, since the number of receivable frames BS may be set so as not to overlap with the zero cross point, the power conversion control device 22 The reception interval STmin between frames may be set depending on the reception capability. When the reception interval STmin is set to 0, the number of receivable frames BS is calculated based on the data transmission time of each frame determined by the bit length of the subsequent frame CF and the communication speed of the network.

<Maintenance data processing unit 56>
The maintenance data processing unit 56 performs processing according to the received maintenance data. The received maintenance data is stored in a storage device 91 such as a RAM. For example, when the maintenance data is update data, the maintenance data processing unit 56 stores the update data in a storage device 91 such as an EEPROM (Electrically Erasable Programmable Read Only Memory) at the timing when the power conversion control device 22 is shut down. Update software.

  When the maintenance data is diagnostic data for requesting to return various states related to the power conversion device 20 such as the accumulated power conversion time, the charging capacity of the power storage device 5 and the abnormality information of the power conversion device 20 described above, The maintenance data processing unit 56 transmits the requested response data of the state of the power conversion device 20 stored in the storage device 91 such as a RAM to the gateway device 30 by CAN communication, and the gateway device 30 sends the response data to the center. 60. The maintenance data processing unit 56 transmits a response data frame to the gateway device 30 while avoiding the zero cross point.

Embodiment 2. FIG.
Next, the power conversion control system 1 according to Embodiment 2 will be described. The description of the same components as those in the first embodiment is omitted. The basic configuration of the power conversion control system 1 according to the present embodiment is the same as that of the first embodiment, but the processing of the flow control information transmission unit 54 is different.

  Also in the present embodiment, as in the first embodiment, after receiving the start frame FF, the flow control information transmission unit 54 detects the zero cross point based on the detected zero cross point and the transmission time of the data of each frame. The flow control information FC is calculated and transmitted to the gateway device 30 so that the timing to perform and the timing to receive the data of each frame do not overlap.

  However, the details of the calculation process of the flow control information FC that avoids this zero cross point are different from those of the first embodiment. This will be described with reference to the flowchart of FIG. First, in step S710, the zero cross detection unit 52 of the power conversion control device 22 detects a zero cross point (time).

  The maintenance data receiving unit 55 receives the start frame FF transmitted from the gateway device 30. In step S720, the flow control information transmission unit 54 proceeds to step S730 when the start frame FF is received, and ends the process when the start frame FF is not received.

  When the flow control information transmission unit 54 receives the start frame FF (step S720: YES), in step S730, the flow control information transmission unit 54 determines the next zero cross based on the zero cross point detected in step S710 and the transmission time of the data of each frame. By the point, it is determined whether or not it is possible to receive data having a number of frames greater than or equal to a predetermined number of determinations (set to 1 in this example).

  As in the first embodiment, the flow control information transmitting unit 54 calculates a time interval from the current time when the start frame FF is received to the next zero cross point (time), and the flow control information is calculated from the calculated time interval. The value obtained by subtracting the transmission time of the FC frame is divided by the value obtained by adding the reception interval STmin between frames (0 in this example) to the transmission time of data in each frame (216 μsec in this example). The value obtained by rounding down the decimal point is calculated as the number of frames that can be received by the next zero cross point. Then, the flow control information transmission unit 54 determines whether or not the calculated number of receivable frames is equal to or greater than the determination number (1 in this example).

  If the flow control information transmission unit 54 determines that the data of the number of frames equal to or larger than the determination number can be received by the next zero cross point (step S730: YES), the flow control information transmission unit 54 proceeds to step S740, and sets each zero cross point time interval. A transmission command for requesting transmission of one frame number of data at a transmission interval of frame data is transmitted to the gateway device 30 as flow control information FC.

  In the present embodiment, the flow control information transmission unit 54 sets “0” indicating “continuous reception is possible” in the receivable state FS in the flow control information FC, and sets “0” as the receivable frame number BS. “0” is set, and “zero cross point time interval” is set as the reception interval STmin between frames.

  When the maintenance data transmission unit 32 of the gateway device 30 receives the flow control information FC of the transmission command, the maintenance data transmission unit 32 sequentially transmits data of one frame number at a time interval of zero cross points. In the present embodiment, the maintenance data transmission unit 32 sequentially transmits one subsequent frame CF at a reception interval STmin set as a time interval of zero cross points. Then, the maintenance data receiving unit 55 of the power conversion control device 22 receives the transmitted subsequent frame CF.

  On the other hand, if the flow control information transmission unit 54 determines that data having a frame number equal to or greater than the determination number (1 in this example) cannot be received by the next zero cross point (step S730: NO), the flow control information transmission unit 54 proceeds to step S750. A standby command for requesting standby without transmitting frame data is transmitted to the gateway device 30 as the flow control information FC, and then the process proceeds to step S760. In the present embodiment, the flow control information transmission unit 54 sets “1” indicating “standby” in the receivable state FS in the flow control information FC, the number of receivable frames BS, and the reception interval STmin between frames. Is set to an arbitrary value, for example, “0”.

  In step S760, the flow control information transmission unit 54 determines whether the zero cross point has elapsed. When the zero cross point has elapsed, the flow control information transmission unit 54 proceeds to step S740 described above, and transmits one frame number of data at the data transmission interval of each frame set as the time interval of the zero cross point. The requested transmission command is transmitted to the gateway device 30 as flow control information FC. On the other hand, if the zero cross point has not elapsed, the flow control information transmission unit 54 repeats step S760 until the zero cross point has elapsed.

  In subsequent step S770, maintenance data receiving unit 55 determines whether or not all maintenance data has been received. The maintenance data receiving unit 55 determines whether the total maintenance data included in each frame received so far has reached the total data length of the maintenance data included in the start frame FF. If all the maintenance data has been received, the process ends. If all the maintenance data has not been received, step S770 is repeated until all the maintenance data is received.

<Example of transmission / reception behavior>
FIG. 13 shows an example of maintenance data transmission / reception behavior by the processing of the flowchart of FIG. In the example of FIG. 13, the total number of subsequent frames CF is 11, the AC power supply 6 is 50 Hz, and the time interval between zero cross points is 10 ms.

  First, when the flow control information transmission unit 54 receives the start frame FF, it takes 4 ms until the next zero cross point, and therefore, (4−0.216) ÷ (0.216 + 1) = 3.11. Since it is determined that the subsequent frame CF can be received and is equal to or greater than the determination number set to 1, the flow control information FC includes FS = 0 (continuous reception is possible), BS = 0 (unrestricted continuous reception is possible), STmin = 10 (reception interval) is set and transmitted to the gateway device 30. Maintenance data transmission unit 32 of gateway device 30 sequentially transmits all subsequent frames CF # 1, # 2,... # 11 one by one at intervals of 10 ms in accordance with flow control information FC. Then, maintenance data reception unit 55 receives all the subsequent frames CF # 1, # 2,.

  In this way, by transmitting the subsequent frames CF one by one at the time interval between the zero cross points, the timing for detecting the zero cross point and the timing for receiving the data of each frame can be prevented from overlapping each other. Detection error can be suppressed.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

DESCRIPTION OF SYMBOLS 1 Power conversion control system, 20 Power converter, 30 Gateway apparatus, 31 Maintenance data receiving part, 32 Maintenance data transmission part, 33 Response receiving part, 34 Start frame transmission part, 35 Data transmission part, 41 Connector, 40 Communication apparatus, 6 AC power supply, 5 power storage device, 51 AC voltage detection unit, 52 zero cross detection unit, 53 switching control unit, 54 flow control information transmission unit, 55 maintenance data reception unit, FF start frame, CF subsequent frame, FC flow control information, FS receivable status, number of BS receivable frames, STmin frame interval

Claims (5)

A power conversion device that converts AC power into DC power, a maintenance device for maintaining the power conversion device is divided into a plurality of frames, and a gateway device that transmits the data of each divided frame to the power conversion device; A power conversion control system comprising:
In response to the start frame, the gateway device responds to the start frame with a start frame transmission unit that transmits a start frame including information of the maintenance data to start transmission to the power converter when starting transmission of the maintenance data A maintenance data transmission unit that sequentially transmits the data of each frame to the power conversion device at a timing specified in the flow control information transmitted from the power conversion device;
The power converter includes a zero cross point that detects a zero cross point at which the input AC voltage crosses zero volts, and transmits the detected zero cross point and data of each frame after receiving the start frame. The gateway calculates the flow control information for instructing the transmission timing of the data of each frame so that the timing of detecting the zero cross point and the timing of receiving the data of each frame do not overlap based on time A power conversion control system comprising: a flow control information transmission unit that transmits to a device; and a maintenance data reception unit that receives data of each frame transmitted from the gateway device. The flow control information transmitting unit, when receiving the start frame, based on the time until the next zero cross point and the transmission time of the data of each frame, a predetermined determination by the next zero cross point It is determined whether or not the data of the number of frames or more can be received, and when it is determined that the data cannot be received, a standby command for requesting standby without transmitting the data of each frame is used as the flow control information Sent to the gateway device,
2. The power conversion control system according to claim 1, wherein, when the maintenance data transmission unit receives the flow control information of the standby command, the maintenance data transmission unit waits without transmitting data of each frame. The flow control information transmitting unit, when receiving the start frame, based on the time until the next zero cross point and the transmission time of the data of each frame, a predetermined determination by the next zero cross point It is determined whether or not data of a number of frames or more can be received. If it is determined that the data can be received, the next zero cross is determined based on the time until the next zero cross point and the data transmission time of each frame. Calculate the number of frames that can be received up to a point, and send a transmission command requesting to transmit data of the number of frames that can be received to the gateway device as the flow control information,
3. The power conversion control system according to claim 1, wherein, when the maintenance data transmission unit receives the flow control information of the transmission command, the maintenance data transmission unit sequentially transmits data of the requested number of frames. The flow control information transmission unit, after receiving the start frame, until the reception of all the maintenance data, every time the zero cross point passes, the time to the next zero cross point and the data of each frame Based on the transmission time, the number of frames that can be received by the next zero cross point is calculated, and the transmission command that requests transmission of data of the number of frames that can be received is transmitted to the gateway device as the flow control information. Send
The power conversion control system according to any one of claims 1 to 3, wherein, when the maintenance data transmission unit receives the flow control information of the transmission command, the maintenance data transmission unit sequentially transmits data of a requested number of frames. . The flow control information transmission unit determines that data having a frame number equal to or greater than the determination number cannot be received, and transmits the standby instruction to the gateway device, and then passes the zero cross point when the next zero cross point has elapsed. A transmission command for requesting transmission of data of one frame number at the transmission interval of the data of each frame set in the time interval is transmitted to the gateway device as the flow control information;
When it is determined that data having the number of frames equal to or greater than the determination number can be received, the data requesting one frame number is transmitted at the data transmission interval of each frame set to the time interval of the zero cross point. Sending a transmission command to the gateway device as the flow control information,
The power conversion control system according to claim 2, wherein the maintenance data transmission unit sequentially transmits data of one frame number at the transmission interval when the flow control information of the transmission command is received.

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